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61 lines
2.0 KiB
Groff
61 lines
2.0 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_STREAM_WEIGHT.md
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.TH CURLOPT_STREAM_WEIGHT 3 "2024-06-01" libcurl
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.SH NAME
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CURLOPT_STREAM_WEIGHT \- numerical stream weight
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_STREAM_WEIGHT, long weight);
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.fi
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.SH DESCRIPTION
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Set the long \fIweight\fP to a number between 1 and 256.
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When using HTTP/2, this option sets the individual weight for this particular
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stream used by the easy \fIhandle\fP. Setting and using weights only makes
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sense and is only usable when doing multiple streams over the same
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connections, which thus implies that you use \fICURLMOPT_PIPELINING(3)\fP.
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This option can be set during transfer and causes the updated weight info get
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sent to the server the next time an HTTP/2 frame is sent to the server.
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See section 5.3 of RFC 7540 for protocol details.
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Streams with the same parent should be allocated resources proportionally
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based on their weight. If you have two streams going, stream A with weight 16
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and stream B with weight 32, stream B gets two thirds (32/48) of the available
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bandwidth (assuming the server can send off the data equally for both
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streams).
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.SH DEFAULT
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If nothing is set, the HTTP/2 protocol itself uses its own default which is
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16.
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.SH PROTOCOLS
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HTTP
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.SH EXAMPLE
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.nf
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int main(void)
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{
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CURL *curl = curl_easy_init();
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CURL *curl2 = curl_easy_init(); /* a second handle */
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/one");
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curl_easy_setopt(curl, CURLOPT_STREAM_WEIGHT, 10L);
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/* the second has twice the weight */
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curl_easy_setopt(curl2, CURLOPT_URL, "https://example.com/two");
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curl_easy_setopt(curl2, CURLOPT_STREAM_WEIGHT, 20L);
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/* then add both to a multi handle and transfer them! */
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}
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}
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.fi
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.SH AVAILABILITY
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Added in 7.46.0
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.SH RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH SEE ALSO
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.BR CURLMOPT_PIPELINING (3),
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.BR CURLOPT_PIPEWAIT (3),
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.BR CURLOPT_STREAM_DEPENDS (3),
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.BR CURLOPT_STREAM_DEPENDS_E (3)
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